Bun crash (incorrect alignment) on Windows 11 arm64 before any prompt submitted

Bug Description

Claude Code VSCode extension crashes on startup before any prompt is submitted. The underlying Bun runtime panics with an incorrect alignment error. This happens consistently — both spawned Claude processes crash ~81 seconds after launch.

Environment

• OS: Windows 11 Home (arm64) v10.0.26100
• Extension version: 2.1.49 (win32-arm64)
• Bun version: v1.3.10 (1423d3c8)
• CPU: ARM64 (neon fp aes crc32 atomics)
• RAM: 16.59GB

Steps to Reproduce

1. Open VSCode with the Claude Code extension (v2.1.49) on Windows 11 arm64
2. Extension activates and spawns Claude processes normally
3. Do not submit any prompt — just wait
4. After ~81 seconds, the process crashes

Error Output

Bun v1.3.10 (1423d3c8) Windows arm64
Windows v.win11_dt
CPU: neon fp aes crc32 atomics
Elapsed: 81852ms | User: 625ms | Sys: 359ms
RSS: 0.46GB | Peak: 0.57GB | Commit: 0.68GB | Faults: 147667 | Machine: 16.59GB

panic(thread 11420): incorrect alignment

oh no: Bun has crashed. This indicates a bug in Bun, not your code.

The crash happened on two separate channels simultaneously, both with exit code 3.

Bun Crash Report

https://bun.report/1.3.10/W_11423d3cmgEugogCwmzrfwl0uiBgyvBw32CwmvBo7xB44wCwvhgmCw236lC4i16lCg6xjkBgsjufCYKERNEL32.DLLg0jCCSntdll.dlloqi1BA0eNrLzEvOLypKTS5RSMzJTM/LTc0rAQBMcwep

Additional Context

An MCP error also appears in the logs prior to the crash, which may or may not be related:

[ERROR] MCP server "claude-vscode" Failed to fetch tools: MCP error -32601: Method not found

The extension restarts after the crash but the same cycle repeats.